Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4932291f5c12923…

MALICIOUS

PDF

83.8 KB Created: 2021-08-31 01:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2c97434b25d6a8f024b9bfe6f99efd4a SHA-1: 274caf5d6e2e9d91c3b49f887577429e7053ca6f SHA-256: f4932291f5c12923f4fa9d236086b38d35a42c5539c13ba604c7bdc04fd5fefe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs that function as a link farm, with many pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDFs designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://huntic.ru/uplcv?utm_term=3+way+compare+and+contrast+chart PDF link annotation
    • https://bharatbiodiesel.com/userfiles/file/duban.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/wolodipunefizez.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/buneg.pdfIn PDF document text
    • http://scottsdalehighbeavers1978.com/clients/80197/File/44611182997.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/mebabinobijojujisolurude.pdfIn PDF document text
    • http://becucci.it/userfiles/files/keruxexitivalewo.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac91a831da---18494136488.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/76919256411.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/raduxudikazabo.pdfIn PDF document text
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/95503818974.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/21a05881c0b6368b0b1499bb5885be87/78298622352.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/9d74d86acd738092284d29597e25216f/93149972230.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cd89baa31---66597686936.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/10123268240.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/138fffplokf3comutvfkb1e61n/balunibotekuv.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/3505127731.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/faxesuxukegetaditadepu.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp//files/letoxumekuz.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff2daddbd5f---91414249067.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/85919117843.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/88616613841.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/43900091782.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/3217dcb7d6a0b992b95025cca922c59c/56826338742.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE291 17676 bytes
SHA-256: c0c8815d3d4f117f11616687b7327f2e768cee034a972429c298b360ff3384bd
font_01_sfnt_off00011057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11057 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001286e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286E 10916 bytes
SHA-256: 64e4970f860297c70c827075a30302f88292cf8d932c687c6703ef4bffacbaab

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